Every spring, she would dump three or four gallons of straight chlorine bleach on the patio stones and then scrub it in. I warned her, but she always thought she was smarter than me and she ignored my advice.

Tsk tsk. After ten years as the tree slowly died, I remember the day the arborist came to cut it down. I had him come over to my house to tell him why it happened. He had no idea she was using toxic chlorine bleach around the tree.